Pipe joint

Abstract

A pipe joint provided with a joint main body having a male screw portion and a cap nut screwed on the male screw portion of the joint main body. And, the pipe joint has an outer-fitting cylinder portion and an insertion cylinder portion holding an end portion of an elastically deformable connected pipe on inner and outer sides. And, a C-shaped stop ring, having a slit on its periphery and disposed within a tapered portion of a hole portion of the cap nut, is provided. The stop ring has a holding female portion formed through an inner peripheral face and a peripheral face of the stop ring. A rotator, held within the holding female portion as to rotate, touching the tapered portion of the hole portion of the cap nut, elastically forming a peripheral concave groove on a peripheral face of the pipe, and deforming the end portion of the pipe into a tapered portion increasing in diameter, is provided.

What is claimed is: 
     
       1. A pipe joint having a joint main body having a male screw portion, and a cap nut screwed on the male screw portion, comprising:
 a C-shaped stop ring, having an opening on its periphery and disposed in a tapered portion of a hole portion of the cap nut; 
 a holding female portion formed though an inner peripheral face and a peripheral face of the C-shaped stop ring; 
 a rotator, held as to rotate in the holding female portion, touching the tapered portion of the hole portion of the cap nut, and forming a peripheral concave groove on a peripheral face of a connected pipe by plastic deformation; and 
 a hitching ridge portion on the inner peripheral face of the stop ring hitching to the peripheral concave groove. 
 
     
     
       2. A pipe joint having a joint main body having a male screw portion, a cap nut screwed on the male screw portion, and an outer-fitting cylinder portion and an insertion cylinder portion on the joint main body for holding an end portion of a plastically-deformable connected pipe from outside and inside, comprising:
 a C-shaped stop ring, having an opening on its periphery and disposed in a tapered portion of a hole portion of the cap nut; 
 a holding female portion formed through an inner peripheral face and a peripheral face of the C-shaped stop ring; 
 a rotator, held as to rotate in the holding female portion, touching the tapered portion of the hole portion of the cap nut, forming a peripheral concave groove on the peripheral face of the pipe by plastic deformation, and forcing the end portion of the pipe into an opening tapered portion; 
 an inner peripheral face on the outer-fitting cylinder portion for forming a gap with the end portion of the pipe as the end portion is deformed into the tapered portion; and 
 a peripheral face on the insertion cylinder portion having a peripheral groove corresponding to the peripheral concave groove of the connected pipe for making an inner peripheral face of the pipe circularly diminish in the diameter direction when the peripheral concave groove is plastically deformed. 
 
     
     
       3. The pipe joint as set forth in  claim 2 , wherein the stop ring has a hitching ridge portion on the inner peripheral face hitching to the peripheral concave groove. 
     
     
       4. The pipe joint as set forth in  claim 2  or  claim 3 , further comprising a circular holding groove portion formed on the peripheral face of the insertion cylinder portion of the joint main body, and a seal member, held within the holding groove portion and touching the inner peripheral face of the pipe. 
     
     
       5. The pipe joint as set forth in  claim 1 ,  2  or  3 , wherein a pair of the joint main bodies have an outer brim portion respectively, in each of which a flat mating end face at right angles with an axis of the pipe is formed on an opposite side to a pipe insertion portion, and there is further provided a detachably attached fastening ring body, having a fastening concave groove to hold the outer brim portions with the mating end faces of the pair of joint main bodies tightly fit to each other.